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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
The SI unit of quantity of electric charge is the coulomb, which is equivalent to about 7018624200000000000â 6.242Ã1018 e (e is the charge of a proton). Hence, the charge of an electron is approximately 3018839800000000000â â1.602Ã10â19 C.y convention, the charge of an electron is â1, while that of a proton is +1. Charged particles whose charges have the same sign repel one another, and particles whose charges have different signs attract.